CN101682341B - Increasing sensitivity of radio receiver - Google Patents
Increasing sensitivity of radio receiver Download PDFInfo
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- CN101682341B CN101682341B CN200880018147.6A CN200880018147A CN101682341B CN 101682341 B CN101682341 B CN 101682341B CN 200880018147 A CN200880018147 A CN 200880018147A CN 101682341 B CN101682341 B CN 101682341B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3078—Circuits generating control signals for digitally modulated signals
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Abstract
A direct-conversion radio receiver is provided. The receiver includes a first measurement unit (120) configured to measure a signal level of a received signal at an input of the receiver. The receiver also includes a gain controller (122) configured to stepwise adjust at least a front-end gainand a baseband gain of the receiver when the signal level of the received signal at the input of the receiver exceeds a given sensitivity level, and adjust the front-end gain with at least one further gain step when the input signal level is below the given sensitivity level.
Description
Technical field
The present invention relates to increase sensitivity of method and the setting of radio receiver.Embodiments of the invention can advantageously be applied to the mobile radio station of cellular radio system or the receiver of base station.
Background technology
In telecommunication system, transmission channel always causes interference to transfer of data.Interference occurs in all systems, but especially in radio telecommunications system, and radio path makes signal attenuation and the distortion that sends in every way.On radio path, disturb to cause by multipath propagation, various decline and reflection and at other signals that the same wireless power path sends usually.
In radio communication environment, typically propagation conditions constantly changes.Take place in the signal that in mobile radio station and base station, receives constantly to change or decline.Yet at a distance of more far away, the signal attenuation of transmission is more many each other for transceiver.
The receiver of modern telecommunication systems must satisfy the many demands that exist in the relevant criterion.Usually, receiver is designed to sensitivity and linear balance.Usually, favorable linearity promotes signal quality.
The sensitivity of receiver has shown that receiver receives the ability of weak signal.Than the receiver with weak sensitivity, sensitive receiver can receive signal from farther reflector (for example cellular system base station).Perhaps, when use has the receiver of better sensitivity, the through-put power that use the base station may be littler.
Known ground, the big gain of receiver will increase the sensitivity of receiver.This is suitable for especially with the receiver of low noise amplifier as the first order of receiver one of (or the first order).In this receiver, high-gain amplifier is enlarged into such high level with signal so that from subsequently the level noise will be left in the basket.Yet high level signal has such defective, namely needs many electric currents (and power) to satisfy linear demand in amplifying stage and level subsequently.
In having the equipment of limited battery capacity (for example mobile radio station), can not use a large amount of power to compensate big gain to the influence of linearity.Therefore, sensitivity and the linearity that is restricted to receiver that gains remain on the acceptable level.
The another program that increases the sensitivity of receiver is to use two low noise amplifiers of series connection.Yet, owing to will satisfy linearity specifications, so this will cause the high power consumption for these grades and later level.
Summary of the invention
The object of the present invention is to provide a kind of improved plan, to increase the sensitivity of receiver.According to an aspect of the present invention, provide a kind of Direct Transform radio receiver, comprising: first measuring unit is configured to measure the signal level in the input of described receiver; And gain controller, be configured to when the signal level in the input of described receiver surpasses given level of sensitivity, at least progressively regulate front-end gain and the baseband gain of described receiver; And when incoming signal level is lower than described given level of sensitivity, regulate described front-end gain by at least one further gain step.
According to a further aspect of the invention, provide the method in a kind of Direct Transform radio receiver, described method comprises: measure the signal level in the input of described receiver; When the signal level in the input of described receiver surpasses given level of sensitivity, at least progressively regulate front-end gain and the baseband gain of described receiver; And when incoming signal level is lower than described given level of sensitivity, regulate described front-end gain by at least one further gain step.
The embodiment of the invention provides a plurality of advantages.For example, when embodiment was applied to mobile radio station, the performance increase of the sensitivity of mobile radio station can help mobile radio station and network to keep connection base station further away from each other between mobile radio station and the base station.
In an embodiment of the present invention, receive the sensitivity that signal increases receiver by utilizing during very near given level of sensitivity extra gain step to amplify when received signal level.Therefore, when receiver was receiving weak signal and just regular meeting is switching to another base station or losing connection, extra gain step had improved the sensitivity of mobile station transceiver.Extra gain step reduces the linearity of receiver, is not deciding factor in the situation lower linear demand of using extra gain step still.
Description of drawings
Hereinafter, with reference to embodiment and accompanying drawing the present invention is described in more detail, wherein
Fig. 1 is the block diagram according to the device of the embodiment of the invention;
Fig. 2 illustrates the example of low noise amplifier being used extra gain step;
Fig. 3 A and 3B illustrate the example of frequency mixer being used extra gain step;
Fig. 4 illustrates the simplification example of the device that can use the embodiment of the invention;
Fig. 5 is the flow chart that the embodiment of the invention is shown.
Embodiment
Fig. 1 is the simplification example that can use the device of the embodiment of the invention.This device comprises the Direct Transform radio receiver.Radio receiver comprises: front end 100, analog baseband section 102 and digital section 104.Front end 100 comprises: antenna 106, it is configured to received RF signal.In low noise amplifier 108, amplify the signal that receives.Use local oscillator signals LO in frequency mixer 110, amplifying signal to be downconverted into base band.Base band part 102 comprises: baseband gain amplifier 112, channel selection filter 114, automatic gain controll block 116 and analog to digital converter (ADC) 118, the signal that analog to digital converter (ADC) 118 is configured to receive converts numerical data to, be used for receiver digital section 120 with reprocessing.This device also can comprise because the simple miscellaneous part that does not illustrate in Fig. 1, for example filter.
This device comprises controller 122, and it is configured to control the operation of the different piece of receiver.Controller 122 is connected to digital section or the Digital Signal Processing portion 120 of receiver.Controller can be connected to I/O (I/O) portion 124 of this device.I/O portion 124 can comprise display, keyboard, loud speaker and microphone and various interface.Controller 122 can be connected to memory 126, required software and data when memory 126 is configured to be stored in this device operation.If this device is transceiver, then controller can be connected to transmitter section 128.
The radio receiver of telecommunication system and transceiver must satisfy the standard of system.Described standard guarantee the device of a plurality of manufacturers can be in system cooperating operation.For example, the receiver of given telecommunication system must have given sensitivity.Sensitivity can be restricted to the quantity of power that receiver must be realized specific baseband performance.Can use many standards to come measurement performance, for example specific bit error rate or signal to noise ratio.
Typically, measure sensitivity with dBm.For example, in some systems based on GSM, receiver must have at least-sensitivity of 102dBm.In utilizing the WCDMA system of Band I, receiver must have at least-sensitivity of 106.7dBm; In the system that utilizes WCDMA Band II, receiver must have at least-sensitivity of 104.7dBm.These numerical value only are used as the example of probable value.
In the prior art, the gain of receiver and especially first activity level be designed so that the sensitivity of related specifications and linear demand all are satisfied and are balanced.Therefore, by the maximum gain of receiver and by satisfying the identical receiver configuration that linear measurement (for example modularization) is passed through, realize the optimum sensitivity of receiver.
When the signal level that receiver needs the situation major part of maximum sensitivity to occur in reception is hanged down.In this case, receiver (for example mobile radio station) is probably away from the base station.This means that also interference signal does not exist, and perhaps they are very low.
Interference signal do not exist or very low situation under because linear demand in this case is not deciding factor, so can promote sensitivity.In the telecommunication system (for example GSM, WCDMA) of present wide-scale distribution, always make the signal level of linear measurement at the above 3dB of particular system level of sensitivity.
In an embodiment, when the signal level that receives is near or below the given level of sensitivity of related specifications very much, increase the sensitivity of receiver by increasing extra gain step.It is more of a specified duration that the performance increase of sensitivity can help receiver and network to keep being connected opening, and base station further away from each other.
In an embodiment, controller 122 receives measurement data from digital section 120.Drop to given level of sensitivity when following when controller 122 detects the signal level that receives signal, can control the gain that the front end increase is used to received signal.Controller 122 can be with the one or more parts of extra gain-adjusted signal application in front end 100.
In an embodiment, low noise amplifier 108 or frequency mixer 110 are used extra adjusting again.In an embodiment, by short circuit or reduce resistance (a plurality of) in order to the linearisation front-end stage---in the collector resistance of LNA level or at the emitter resistance of Gilbert frequency mixer---value realize gain-adjusted.As a result, littler in the feedback of this grade, and gain increases in the front portion of receiver, so that no longer be considered to obvious contribution for the noise figure of whole receiver from the noise of later receiver level (as baseband filtering and gain stage).In addition, linearity is lost.Yet will be not there be adverse effect in the loss of this linearity to the performance of receiver.
In an embodiment, when determining to need extra gain adjustment, consider the signal level of possible interference signal.For example, receiver can be configured to measure with in the relevant value of the signal level of the interference signal of receiver input.Described value can be the signal to noise ratio that receives signal, or receives the error rate of signal.
Fig. 2 illustrates the example of low noise amplifier 108 being used extra gain step.Fig. 2 illustrates the low noise amplifier configuration that realizes by differential amplifier.This configuration comprises: cascaded stages 228, and it comprises one group of operational amplifier; With input stage 204, it is connected to cascaded stages 228; Described input stage has two input INP and INM.Cascaded stages comprises two control node A and B.This configuration also comprises collector circuit 206, and it comprises resistor 208 to 214, coil 216,218 and capacitor 220,222.The gatherer circuit also comprises switch 224 and 226 and the control node C of control switch.
In normal running (when the signal level in the input of receiver surpasses given level of sensitivity), by control node A and B application controls signal being controlled the gain of low noise amplifier configuration.In normal running, control node C is not applied voltage.Therefore, by switch 224,226 closures of control node C control, and electric current can pass through.In an embodiment, realize switch by the PMOS technology.Resistor 208,210 in parallel with coil 216 and capacitor 220, and resistor 212,214 in parallel with coil 218 and capacitor 222 correspondingly.
In normal running, when the control Node B being applied voltage but do not control node A, realize low gain.When control node A being applied voltage but do not control Node B, realize high-gain.In both cases, control node C is not applied voltage.
For high gain step, control node C and A are not still applied voltage to the control Node B.Therefore, switch 224,226 is opened, and electric current does not pass through.By coil 216,218 and capacitor 220,222 determine the collector impedance of cascaded stages 228.
The voltage of the control node under different situations can be summarized as follows:
| Low gain | A＝0，B＝1，C＝0 |
| High-gain | A＝1，B＝0，C＝0 |
| Ultra high gain | A＝1，B＝0，C＝1 |
The number of the operational amplifier in cascaded stages can change according to the desired number of gain step.
In an embodiment, receiver is configured to reduce bandwidth when adopting at least one further gain step.
Fig. 3 A illustrates the example of frequency mixer 110 being used extra gain step.Fig. 3 illustrates the simplification mixer configuration that realizes by Gilbert unit 300.The Gilbert unit is cross-linked differential amplifier configuration.This configuration comprises: collector circuit 302, and it is connected to the collector electrode of Gilbert unit; With emitter circuit 304, it is connected to the emitter of Gilbert unit.The Gilbert unit receives local oscillator signals 306 as input.The signal that receives is used as the transistor 308 of emitter circuit, difference input INP, the INM of 310 base stage input.As differential output signal OUTP, the OUTM from collector circuit, obtain output signal.
In an embodiment, frequency mixer 110 using gains are not controlled under normal operation.In front end 100, only apply gain control for low noise amplifier 108.Yet, can be by reducing emitter impedance and increase collector impedance to come frequency mixer is applied extra gain step.In the example of Fig. 3 A, this configuration comprises the variable resistance 312 with gain control 314.By the resistance of regulating resistor 312, can reduce the impedance of emitter, and increase gain.
Fig. 3 B illustrates another example of frequency mixer 110 being used extra gain step.Fig. 3 A illustrates another simplification mixer configuration that realizes by Gilbert unit 300.This configuration comprises: collector circuit 326, and it is connected to the collector electrode of Gilbert unit; With emitter circuit 328, it is connected to the emitter of Gilbert unit.In this embodiment, collector circuit 326 and emitter circuit 328 are applied gain control signal 324.Collector circuit comprises variable resistance 316,318, and emitter circuit comprises variable resistance 320,322.The gain control signal that puts on resistor makes collector circuit resistor 316,318 resistance increase, and makes emitter circuit resistor 320,322 resistance reduce.
Fig. 4 illustrates the simplification example of another device that can use the embodiment of the invention.This device comprises the Direct Transform radio receiver.Radio receiver comprises: antenna 400, it is configured to received RF signal.In this example, in transducer 404, will receive signal and convert difference form to.Receiver comprises first and second low noise amplifiers 406,408.Low noise amplifier has different attributes.First amplifier 406 is configured in its input tolerate high level signals.First Amplifier Gain is less than the gain of second amplifier 408.In addition, has quite high noise figure than second amplifier, 408, the first amplifiers.The ability of tolerate high level signals realizes by using emitter-base bandgap grading impedance occurred frequently and other linearization techniques.
Therefore, than first amplifier, second low noise amplifier has more low gain and more low noise figure.The noise figure of first amplifier may be the magnitude of 10dB, and the noise figure of second amplifier may be 2dB.Yet these numerical value are only as example, and unrestricted the present invention.
After low noise amplifier, the structure of device is similar to the apparatus structure among Fig. 1.Yet in this example, device comprises two branches that begin from frequency mixer.First branch 410 is used for the I branch signal, and second branch 412 is used for the Q branch signal.Each branch comprises frequency mixer, channel selection filter, automatic gain controll block and analog to digital converter (ADC).The output of ADC is connected to the digital section (not shown) of device.Device also comprises: controller 414, it is configured to the operation of control device.
In the example as Fig. 1, controller 414 is configured to control figure portion (not shown) and measures signal level in the input of receiver.In an embodiment, controller 414 receives measurement data from digital section, and detect receive signal signal level greater than still less than given level of sensitivity.Based on these data, the front end of controllable device uses first low noise amplifier 406 or second low noise amplifier 408 to amplify the reception signal.First amplifier 406 is used for obtaining high linear, and second amplifier 408 is used for obtaining low noise figure.Low noise amplifier is designed to, and it has high input impedance if amplifier cuts out, and its input impedance is adapted to signal in its input when it is switched on.Therefore, device does not need to guide any switch of amplifier into receiving signal.Controller 414 can be by opening the expectation amplifier and cutting out the moment selective amplifier that other amplifiers are providing arbitrarily.
Fig. 5 is the flow chart that embodiment is shown.In this example, this embodiment is suitable for the Direct Transform radio receiver of telecommunication system.
In step 500, measure the received signal level in the input of receiver.
In step 502, one or more values that measurement is relevant with the signal level of the possible interference signal of the input of receiver.Described value can be signal to noise ratio, signal-to-jamming ratio or the error rate that receives signal.
In step 504, with signal level and value and the given threshold of measuring.The received signal level of measuring is compared with given level of sensitivity.Given level of sensitivity can be required level of sensitivity in the standard of the telecommunication system discussed, perhaps can derive from this level.The measured value relevant with the signal level of possible interference signal compared with predetermined threshold.Can select level, thereby if make described value surpass predeterminated level, then interference signal can be regarded as and can ignore.For example, if the signal to noise ratio of measuring greater than given threshold value, then interference signal can be left in the basket.
If at least one that measure in level or the value do not satisfy the predetermined threshold value demand, then in step 506, at least progressively regulate front-end gain and the baseband gain of receiver in the mode that keeps the receiver linearity.
All satisfy the predetermined threshold value demand if measure level or value, then in step 508, the front-end gain of regulating receiver by at least one further gain step as follows, described mode is that the operation of front end no longer is linear.Yet described measurement indicates the quality that is connected that linear loss can not reduce receiver and reflector.
The embodiment of the invention can be applicable to such device, and this device can be receiver, handheld radiotelephone or the personal communicator of the mobile radio station of telecommunication system or base station, telecommunication system.In addition, this device can be contained in the card or module that is connected with another device (for example personal computer) between the operating period.
Device can comprise controller, and it can be configured to carry out about the flow chart of Fig. 5 and Fig. 1 to 4 describes in the step at least some.Embodiment can be used as computer program and realizes, described computer program comprises that execution is for increasing the instruction of the Sensitivity calculation machine process of radio receiver.Process can comprise: measure the signal level in the input of receiver; When the signal level in the input of receiver surpasses given level of sensitivity, at least progressively regulate front-end gain and the baseband gain of receiver; And when incoming signal level is lower than given level of sensitivity, regulate front-end gain by at least one further gain step.
Computer program can be stored in by computer or handle on the readable computer program distribution medium.Computer program medium can be for example (but being not limited to) dielectric, magnetizing mediums, optical medium, infrared medium or semiconductor system medium, device medium or transmission medium.Computer program can comprise at least one in the following medium: computer-readable medium, program recorded medium, recording medium, computer-readable memory, random access memory, Erasable Programmable Read Only Memory EPROM, computer-readable software distribution bag, computer-readable signal, computer readable telecommunications signal, computer readable printed matter and computer readable compressed software package.
Although described the present invention with reference to example above with reference to the accompanying drawings, significantly, the present invention is not limited, and can revise in many ways within the scope of the appended claims.
Claims (29)
1. Direct Transform radio receiver comprises:
First measuring unit is configured to measure the signal level at the reception signal of the input of described receiver; And
Gain controller, be configured to when the signal level at the reception signal of the input of described receiver surpasses given level of sensitivity, come at least progressively to regulate front-end gain and the baseband gain of described receiver by one of low gain step and high-gain step, and when the signal level that receives signal is lower than described given level of sensitivity, make that the operation of described front end is non-linear thereby regulate described front-end gain by at least one further gain step.
2. receiver as claimed in claim 1 further comprises:
Second measuring unit is configured to measure the value relevant with the signal level of the interference signal of described receiver input; Wherein
Described gain controller only is configured to regulate described front-end gain by at least one further gain step when the value of measuring is lower than given threshold value.
3. receiver as claimed in claim 2, wherein the value of Ce Lianging is the signal to noise ratio of described reception signal.
4. receiver as claimed in claim 2, wherein the value of Ce Lianging is the error rate of described reception signal.
5. receiver as claimed in claim 1 further comprises:
Low noise amplifier, wherein said gain controller are configured to reduce the feedback in described low noise amplifier.
6. receiver as claimed in claim 1 further comprises:
Frequency mixer, wherein said gain controller are configured to reduce the feedback in described frequency mixer.
7. receiver as claimed in claim 1 further comprises:
The collector impedance that frequency mixer, wherein said gain controller are configured to reduce the emitter impedance of described frequency mixer and increase described frequency mixer.
8. receiver as claimed in claim 1, wherein said receiver comprises independent low noise amplifier and/or frequency mixer, and described independent low noise amplifier and/or frequency mixer will be selected to use during above and below given received signal level when the signal level of described reception signal.
9. receiver as claimed in claim 1, wherein said receiver is global system for mobile communications GSM receiver, and described given level of sensitivity is-102dBm.
10. receiver as claimed in claim 1, wherein said receiver is Wideband Code Division Multiple Access (WCDMA) WCDMA receiver, described given level of sensitivity is-106.7dBm or-104.7dBm.
11. receiver as claimed in claim 1, wherein said receiver are configured to reduce bandwidth when using described at least one further gain step.
12. the method in the Direct Transform radio receiver, described method comprises:
Measurement is in the signal level of the reception signal of the input of described receiver;
When the signal level at the reception signal of the input of described receiver surpasses given level of sensitivity, come at least progressively to regulate front-end gain and the baseband gain of described receiver by one of low gain step and high-gain step; And
When the signal level that receives signal is lower than described given level of sensitivity, regulates described front-end gain by at least one further gain step, thereby make that the operation of described front end is non-linear.
13. method as claimed in claim 12 further comprises:
The value that measurement is relevant with the signal level of the interference signal of described receiver input; And
Only when the value of measuring is lower than given power level, regulate described front-end gain by at least one further gain step.
14. method as claimed in claim 13, wherein the value of Ce Lianging is the signal to noise ratio of described reception signal.
15. method as claimed in claim 13, the value of measurement are the error rates of described reception signal.
16. method as claimed in claim 12 further comprises:
The feedback of minimizing in the front end low noise amplifier of described receiver.
17. method as claimed in claim 12 further comprises:
The feedback of minimizing in the front end frequency mixer of described receiver.
18. method as claimed in claim 12 further comprises:
When using described at least one further gain step, reduce the bandwidth of described receiver.
19. method as claimed in claim 12 further comprises:
Be higher than or be lower than given level of sensitivity according to the signal level of described reception signal, be chosen in the described receiver the low noise amplifier and/or the frequency mixer that use.
20. a telecommunication system comprises the radio receiver of claim 1.
21. a device that is used for the Direct Transform radio receiver, described device comprises:
Be used for measurement at the device of the signal level of the reception signal of the input of described receiver;
Be used for when during above given level of sensitivity, coming at least progressively regulate the front-end gain of described receiver and the device of baseband gain by one of low gain step and high-gain step in the signal level of the reception signal of the input of described receiver; And
When being used for signal level when the reception signal and being lower than described given level of sensitivity, regulate the device of described front-end gain by at least one further gain step, thereby make that the operation of described front end is non-linear.
22. device as claimed in claim 21 further comprises:
The device that is used for the measurement value relevant with the signal level of the interference signal of described receiver input; And
Only be used for when the value of measurement is lower than given power level, regulating the device of described front-end gain by at least one further gain step.
23. device as claimed in claim 22, wherein the value of Ce Lianging is the signal to noise ratio of described reception signal.
24. device as claimed in claim 22, the value of measurement are the error rates of described reception signal.
25. device as claimed in claim 21 further comprises:
Be used for minimizing at the device of the feedback of the front end low noise amplifier of described receiver.
26. device as claimed in claim 21 further comprises:
Be used for minimizing at the device of the feedback of the front end frequency mixer of described receiver.
27. device as claimed in claim 21 further comprises:
Be used for when described at least one the further gain step of application, reducing the device of the bandwidth of described receiver.
28. device as claimed in claim 21 further comprises:
Be used for signal level according to described reception signal and be higher than or be lower than given level of sensitivity, be chosen in the described receiver low noise amplifier that will use and/or the device of frequency mixer.
29. a Direct Transform radio receiver comprises:
First measurement mechanism is used for measurement in the signal level of the reception signal of the input of described receiver; And
The gain controller device is used for when during above given level of sensitivity, at least progressively regulating front-end gain and the baseband gain of described receiver in the signal level of the reception signal of the input of described receiver by one of low gain step and high-gain step; And when the signal level that receives signal during less than described given level of sensitivity, make that the operation of described front end is non-linear thereby regulate described front-end gain by at least one further gain step.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20075392A FI20075392A0 (en) | 2007-05-30 | 2007-05-30 | Improving the sensitivity of the radio receiver |
| FI20075392 | 2007-05-30 | ||
| US11/826,788 US8433273B2 (en) | 2007-05-30 | 2007-07-18 | Increasing sensitivity of radio receiver |
| US11/826,788 | 2007-07-18 | ||
| PCT/FI2008/050292 WO2008145811A1 (en) | 2007-05-30 | 2008-05-21 | Increasing sensitivity of radio receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101682341A CN101682341A (en) | 2010-03-24 |
| CN101682341B true CN101682341B (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880018147.6A Expired - Fee Related CN101682341B (en) | 2007-05-30 | 2008-05-21 | Increasing sensitivity of radio receiver |
Country Status (6)
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|---|---|
| US (1) | US8433273B2 (en) |
| EP (1) | EP2151062B1 (en) |
| CN (1) | CN101682341B (en) |
| CA (1) | CA2687220C (en) |
| FI (1) | FI20075392A0 (en) |
| WO (1) | WO2008145811A1 (en) |
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| US8493126B2 (en) * | 2010-07-15 | 2013-07-23 | Qualcomm Incorporated | Wideband balun having a single primary and multiple secondaries |
| US20130044842A1 (en) * | 2011-08-19 | 2013-02-21 | Hong Kong Applied Science and Technology Research Institute Company Limited | Radio-frequency front ends with automatic gain control |
| GB2539465B (en) * | 2015-06-17 | 2022-02-09 | Kathrein Se | A method and system for producing a jammer signal |
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| US7283851B2 (en) * | 2004-04-05 | 2007-10-16 | Qualcomm Incorporated | Power saving mode for receiver circuit blocks based on transmitter activity |
| US20060068746A1 (en) | 2004-09-30 | 2006-03-30 | Nokia Corporation | Direct conversion receiver radio frequency integrated circuit |
| US20060222116A1 (en) | 2005-03-31 | 2006-10-05 | Freescale Semiconductor, Inc. | AGC with integrated wideband interferer detection |
| JP4605090B2 (en) * | 2005-08-29 | 2011-01-05 | パナソニック株式会社 | High frequency receiver |
| US20070197178A1 (en) * | 2006-02-21 | 2007-08-23 | Nokia Corporation | Automatic gain control system for receivers in wireless communications |
-
2007
- 2007-05-30 FI FI20075392A patent/FI20075392A0/en not_active Application Discontinuation
- 2007-07-18 US US11/826,788 patent/US8433273B2/en not_active Expired - Fee Related
-
2008
- 2008-05-21 CA CA2687220A patent/CA2687220C/en not_active Expired - Fee Related
- 2008-05-21 CN CN200880018147.6A patent/CN101682341B/en not_active Expired - Fee Related
- 2008-05-21 EP EP08761688.4A patent/EP2151062B1/en not_active Not-in-force
- 2008-05-21 WO PCT/FI2008/050292 patent/WO2008145811A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961552B2 (en) * | 2002-03-25 | 2005-11-01 | Broadcom Corporation | LNA gain adjustment for intermodulation interference reduction |
| CN1736031A (en) * | 2003-01-31 | 2006-02-15 | 诺基亚有限公司 | Apparatus, and an associated method, for increasing receiver sensitivity of a direct conversion receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2151062A4 (en) | 2012-05-23 |
| WO2008145811A1 (en) | 2008-12-04 |
| US20080299929A1 (en) | 2008-12-04 |
| CN101682341A (en) | 2010-03-24 |
| EP2151062A1 (en) | 2010-02-10 |
| EP2151062B1 (en) | 2016-04-20 |
| US8433273B2 (en) | 2013-04-30 |
| FI20075392A0 (en) | 2007-05-30 |
| CA2687220A1 (en) | 2008-12-04 |
| CA2687220C (en) | 2013-11-19 |
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